EP2444598A2 - Kohlendioxid-Wiederherstellungsverfahren und Kohlendioxid-Wiederherstellungs-Stromerzeugungssystem - Google Patents

Kohlendioxid-Wiederherstellungsverfahren und Kohlendioxid-Wiederherstellungs-Stromerzeugungssystem Download PDF

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Publication number
EP2444598A2
EP2444598A2 EP11185974A EP11185974A EP2444598A2 EP 2444598 A2 EP2444598 A2 EP 2444598A2 EP 11185974 A EP11185974 A EP 11185974A EP 11185974 A EP11185974 A EP 11185974A EP 2444598 A2 EP2444598 A2 EP 2444598A2
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EP
European Patent Office
Prior art keywords
steam
carbon dioxide
turbine
supplied
cooling water
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Application number
EP11185974A
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English (en)
French (fr)
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EP2444598B1 (de
EP2444598A3 (de
Inventor
Yuya Murakami
Nobuo Okita
Takeo Takahashi
Mikio Takayanagi
Takeo Suga
Takeshi Sasanuma
Toshihisa Kiyokuni
Hideo Kitamura
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Toshiba Corp
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Toshiba Corp
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Publication of EP2444598A2 publication Critical patent/EP2444598A2/de
Publication of EP2444598A3 publication Critical patent/EP2444598A3/de
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Publication of EP2444598B1 publication Critical patent/EP2444598B1/de
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K13/00—General layout or general methods of operation of complete plants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1425—Regeneration of liquid absorbents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/1456—Removing acid components
    • B01D53/1475—Removing carbon dioxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/343—Heat recovery
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
    • F01K17/06—Returning energy of steam, in exchanged form, to process, e.g. use of exhaust steam for drying solid fuel or plant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
    • F01K25/06—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using mixtures of different fluids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
    • F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
    • F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
    • F01K25/103—Carbon dioxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
    • B01D2252/20—Organic absorbents
    • B01D2252/204—Amines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/50—Carbon oxides
    • B01D2257/504—Carbon dioxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/80—Water
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/26—Drying gases or vapours
    • B01D53/265—Drying gases or vapours by refrigeration (condensation)
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/62—Carbon oxides
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
    • Y02C20/00—Capture or disposal of greenhouse gases
    • Y02C20/40—Capture or disposal of greenhouse gases of CO2
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/14—Combined heat and power generation [CHP]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/32—Direct CO2 mitigation

Definitions

  • Embodiments described herein relate generally to a carbon-dioxide-recovery-type steam power generation system and a carbon dioxide recovery method.
  • an amine absorption method is employed as a method of removing and recovering carbon dioxide that is one of causes of global warming.
  • thermal energy obtained from a great amount of steam having low pressure for example, approximately 0.3 MPa is required to regenerate an absorption liquid having absorbed carbon dioxide.
  • a carbon-dioxide-recovery-type steam power generation system comprises a boiler that produces steam and generates an exhaust gas by combusting fuel, a first turbine that is connected to a generator and is rotationally driven by the steam supplied from the boiler, an absorption tower that is supplied with the exhaust gas from the boiler and allows carbon dioxide contained in the exhaust gas to be absorbed into an absorption liquid, a regeneration tower that is supplied with the absorption liquid absorbing the carbon dioxide from the absorption tower, discharges a carbon dioxide gas from the absorption liquid, and discharges the carbon dioxide gas, a reboiler that heats the absorption liquid from the regeneration tower and supplies the generated steam to the regeneration tower, a condenser that removes moisture from the carbon dioxide gas, discharged from the regeneration tower, by condensing the carbon dioxide gas using cooling water, a compressor that compresses the carbon dioxide gas from which the moisture is removed by the condenser, and a second turbine that drives the compressor.
  • FIG. 1 illustrates an overall structure of a carbon-dioxide-recovery-type steam power generation system according to a first embodiment.
  • a carbon-dioxide-recovery-type steam power generation system 1 includes a steam power generation plant 1 a that produces turbine steam 4 through the combustion of fuel and generates power by rotationally driving a turbine and a carbon dioxide recovery plant 1b that recovers carbon dioxide from an exhaust gas 5 produced in a boiler 6 by using an absorption liquid which absorbs carbon dioxide contained in the exhaust gas 5.
  • the boiler 6 is supplied with fuel and air for combustion and fuel is combusted in a furnace, so that the turbine steam 4 is produced and the exhaust gas 5 is generated.
  • the boiler 6 includes a superheater 9 that generates main steam by heating the turbine steam 4 through the combustion in the furnace and a reheater 10 that is provided adjacent to the superheater 9 and generates reheat steam by reheating the turbine steam 4 which is supplied from the superheater 9 through a high-pressure steam turbine 21 to be described below.
  • the steam power generation plant 1 a includes a high-pressure steam turbine (high-pressure turbine) 21 that is rotationally driven by the turbine steam 4 (main steam) supplied from the superheater 9 of the boiler 6 and an intermediate-pressure steam turbine (intermediate-pressure turbine) 22 that is connected to the high-pressure turbine 21 by a turbine shaft 20 and is rotationally driven by the turbine steam 4 (reheat steam) supplied from the high-pressure turbine 21 through the reheater 10 of the boiler 6.
  • high-pressure turbine high-pressure turbine
  • intermediate-pressure turbine intermediate-pressure turbine 22 that is connected to the high-pressure turbine 21 by a turbine shaft 20 and is rotationally driven by the turbine steam 4 (reheat steam) supplied from the high-pressure turbine 21 through the reheater 10 of the boiler 6.
  • a low-pressure steam turbine (low-pressure turbine) 23 is connected to the intermediate-pressure turbine 22 by the turbine shaft 20, and the low-pressure turbine 23 is configured to be rotationally driven by the turbine steam 4 (exhaust steam (intermediate-pressure exhaust steam) from the intermediate-pressure turbine 22) supplied from the intermediate-pressure turbine 22.
  • a generator 24, which generates power by the rotation of the turbine shaft 20, is connected to the turbine shaft 20.
  • the rotating shafts of the high-pressure turbine 21, the intermediate-pressure turbine 22, the low-pressure turbine 23, and the generator 24 are connected to each other so as to form one turbine shaft 20.
  • the steam power generation plant 1 a may include two or more turbine shafts each including at least one steam turbine and a plurality of generators connected to the respective turbine shafts.
  • a steam condenser 26 which generates condensate 27 by cooling and condensing the turbine steam (exhaust steam (low-pressure exhaust steam) from the low-pressure turbine 23) discharged from the low-pressure turbine 23, is provided below the low-pressure turbine 23.
  • the condensate 27 discharged from the steam condenser 26 is sent to the downstream side of a line 28 by a condensate pump 31, and is sent to the boiler 6 by a water supply pump 34 through a line 33.
  • the carbon dioxide recovery plant 1b is provided with a known carbon dioxide separation and recovery plant 40 to which the exhaust gas 5 is supplied from the boiler 6 and which separates and recovers carbon dioxide contained in the exhaust gas 5.
  • the carbon dioxide separation and recovery plant 40 includes an absorption tower (not shown) that absorbs carbon dioxide contained in the exhaust gas 5 into a carbon dioxide absorption liquid and a regeneration tower (not shown) to which the absorption liquid (rich liquid) absorbing the carbon dioxide is supplied from the absorption tower and which discharges a carbon dioxide gas 42 containing water vapor by emitting the carbon dioxide gas from the rich liquid and regenerates the absorption liquid.
  • the absorption liquid regenerated in the regeneration tower is supplied to the absorption tower.
  • An amine compound aqueous solution which is obtained by dissolving an amine compound in water, may be used as the absorption liquid that is used to absorb carbon dioxide.
  • the regeneration tower is provided with a reboiler 41.
  • the reboiler 41 allows the temperature of the lean liquid (regenerated absorption liquid having a small content of carbon dioxide) to rise and produces steam by heating a part of the lean liquid stored in the regeneration tower and supplies the steam to the regeneration tower.
  • a carbon dioxide gas is discharged from the lean liquid, and is supplied to the regeneration tower together with the absorption liquid steam.
  • the absorption liquid steam ascends in the regeneration tower, and heats the rich liquid. Therefore, the carbon dioxide gas is discharged from the rich liquid.
  • the steam discharged from the reboiler 41 is joined as drainage to the appropriate position in the line 28 between the condensate pump 31 and the water supply pump 34.
  • the carbon dioxide gas 42 containing water vapor discharged from the top portion of the regeneration tower of the carbon dioxide separation and recovery plant 40 is supplied to a CO 2 condenser (condenser) 51.
  • the water vapor (moisture) condensed by the CO 2 condenser 51 is returned to the regeneration tower of the carbon dioxide separation and recovery plant 40 (not shown).
  • a carbon dioxide 52 from which the water vapor (moisture) is removed to increase purity by the CO 2 condenser 51 is compressed by compressors 53 and 54 into a high pressure state (for example, approximately 8 MPa) which is appropriate to be injected into the ground.
  • the carbon dioxide 52 compressed by the compressor 53 is cooled by an intermediate cooler 55 and is compressed by the compressor 54. Further, the carbon dioxide 52 compressed by the compressor 54 is cooled by an exit cooler 56.
  • the intermediate cooler 55 and the exit cooler 56 are provided in this way, it is possible to improve the compressing efficiency and recover heat from the carbon dioxide 52 increasing in temperature with the compressing.
  • the compressors 53 and 54 are coaxially connected to a turbine (driving turbine) 57 and a motor 58 driving the compressors 53 and 54.
  • the motor 58 is supplied with, for example, electric power generated by the generator 24.
  • a turbine 57 is supplied with steam 62, which is generated by the heat-exchanging between cooling water 61 and the carbon dioxide gas 42 containing water vapor in the CO 2 condenser 51, and the steam is used to drive the turbine 57. Accordingly, the heat recovered by the CO 2 condenser 51 may be used as the power of the turbine 57, and may supplement a part of the power of the compressors 53 and 54.
  • the steam discharged from the turbine 57 is changed into condensate by a steam condenser 63, and is sent as the cooling water 61 to the CO 2 condenser 51 by a pump 64.
  • the thermal energy of the carbon dioxide 42 emitted from the regeneration tower of the carbon dioxide separation and recovery plant 40 may be recovered, and the generated steam may be supplied to the compressor-driven turbine 57 so as to supplement a part of power of the compressors 53 and 54.
  • the carbon-dioxide-recovery-type steam power generation system 1 may efficiently recover the thermal energy and realize the high thermal efficiency.
  • the carbon-dioxide-recovery-type steam power generation system 1 may suppress degradation of the output of the steam power generation plant 1a in accordance with the ensured power source for compressing the carbon dioxide.
  • Fig. 2 illustrates a schematic structure of a carbon-dioxide-recovery-type steam power generation system according to a second embodiment.
  • This embodiment is different from the first embodiment shown in Fig. 1 in that the cooling water 61 performs the heat exchanging between the carbon dioxide gas 42 containing water vapor and the steam 18 for heating the reboiler.
  • the same portions as the portions of the first embodiment shown in Fig. 1 are denoted by the same reference numerals. The description thereof will not be repeated.
  • the cooling water 61 exchanges heat with the carbon dioxide gas 42 containing water vapor in the CO 2 condenser 51, and then exchanges heat with the steam 18 which is a heat source of the reboiler 41 in the temperature decreasing unit 44.
  • the steam 62 generated by the heat exchanging between the carbon dioxide gas 42 containing water vapor and the steam 18 is supplied to the turbine 57, and supplements a part of the power of the compressors 53 and 54.
  • the steam 18 extracted or exhausted from the high-pressure turbine 21, the intermediate-pressure turbine 22, or the low-pressure turbine 23 is guided to the reboiler 41 so as to be used as a heat source of the absorption liquid used to absorb the carbon dioxide, and is also used as a heat source of the steam 62 which drives the turbine 57.
  • the carbon-dioxide-recovery-type steam power generation system 1 may more efficiently recover the thermal energy and realize the higher thermal efficiency by recovering heat from the steam 18 for heating the reboiler.
  • Fig. 3 illustrates a schematic structure of a carbon-dioxide-recovery-type steam power generation system according to a third embodiment.
  • This embodiment is different from the second embodiment shown in Fig. 2 in that the system includes a valve 71 adjusting the flow rate of the cooling water 61 and a control unit 72 measuring the temperature of the steam 18 decreased in temperature by the temperature decreasing unit 44 and controlling the opening degree of the valve 71.
  • the valve 71 is provided between the pump 64 and the CO 2 condenser 51, and may change the flow rate of the cooling water 61 supplied to the CO 2 condenser 51 and the temperature decreasing unit 44, that is, the flow rate of the cooling water 61 exchanging heat with the carbon dioxide gas 42 containing water vapor and the steam 18 in accordance with the opening degree of the valve 71.
  • the control unit 72 measures the temperature of the steam 18 passing through the temperature decreasing unit 44, and controls the opening degree of the valve 71 so that the temperature of the steam 18 supplied to the reboiler 41 becomes a temperature necessary for emitting the carbon dioxide from the absorption liquid in the regeneration tower of the carbon dioxide separation and recovery plant 40.
  • the opening degree of the valve 71 is made to be large so as to increase the flow rate of the cooling water 61. Accordingly, the amount of the cooling water 61 exchanging heat with the steam 18 in the temperature decreasing unit 44 increases, and hence the temperature of the steam 18 supplied to the reboiler 41 decreases.
  • the opening degree of the valve 71 is made to be small so as to decrease the flow rate of the cooling water 61. Accordingly, the amount of the cooling water 61 exchanging heat with the steam 18 in the temperature decreasing unit 44 decreases, and hence the temperature of the steam 18 supplied to the reboiler 41 increases.
  • the carbon-dioxide-recovery-type steam power generation system may recover the heat from the carbon dioxide gas 42 containing water vapor and the steam 18 for heating the reboiler and set the temperature of the steam 18 supplied to the reboiler 41 at a desired temperature by adjusting the flow rate of the cooling water 61 exchanging heat with the carbon dioxide gas 42 containing water vapor and the steam 18.
  • Fig. 4 illustrates a schematic structure of a carbon-dioxide-recovery-type steam power generation system according to a fourth embodiment.
  • This embodiment is different from the second embodiment shown in Fig. 2 in that steam 82 generated by branching a part of the cooling water 61 and causing heat-exchanging with the carbon dioxide 52 in the intermediate cooler 55 is supplied to the turbine 57.
  • the same portions as the portions of the second embodiment shown in Fig. 2 are denoted by the same reference numerals. The description thereof will not be repeated.
  • the cooling water 61 supplied from the pump 64 is branched, so that one part of the cooling water is supplied to the CO 2 condenser 51 and the other part of the cooling water is supplied to the intermediate cooler 55.
  • the flow rate of the cooling water 61 supplied to the intermediate cooler 55 may be adjusted by a valve 81.
  • the cooling water 61 supplied to the intermediate cooler 55 exchanges heat with the carbon dioxide 52 with high temperature (for example, heated up to approximately 200 to 250°C) compressed by the compressor 53, so that the steam 82 is generated.
  • the steam 82 is supplied to the turbine 57, and is used to drive the turbine 57. Accordingly, the heat recovered by the intermediate cooler 55 may be used as the power of the turbine 57, and may supplement a part of the power of the compressors 53 and 54.
  • the branched cooling water 61 exchanges heat with the carbon dioxide 52 compressed by the compressor 53 in the intermediate cooler 55, but may exchange heat with the carbon dioxide 52 compressed by the compressor 54 in the exit cooler 56. Further, the heat exchanging may be performed in the intermediate cooler 55 after the heat exchanging in the exit cooler 56.
  • the carbon-dioxide-recovery-type steam power generation system may further includes the valve 71 and the control unit 72 described in the third embodiment. Such a structure is shown in Fig. 5 . Furthermore, the control unit 72 may be configured to control the opening degree of the valve 81.
  • the cooling water 61 is used so as to recover heat from the carbon dioxide gas 42 containing water vapor or the steam 18 for heating the reboiler, but a medium with a low boiling point such as ammonia may be used.
  • Fig. 6 illustrates a schematic structure of a carbon-dioxide-recovery-type steam power generation system according to a fifth embodiment.
  • This embodiment is different from the first embodiment shown in Fig. 1 in that a part of the condensate 27 is used to exchange heat with the carbon dioxide gas 42 containing water vapor and generated steam 91 is supplied to the low-pressure turbine 23.
  • the same portions as the portions of the first embodiment shown in Fig. 1 are denoted by the same reference numerals. The description thereof will not be repeated.
  • the turbine 57 driving the compressors 53 and 54 are not shown.
  • the steam 91 is obtained in such a manner that the cooling water (condensate 27) branched from the line 28 at the downstream side of the condensate pump 31 recovers the heat of the carbon dioxide gas 42 containing water vapor in the CO 2 condenser 51, and the steam 91 is supplied to the low-pressure turbine 23.
  • the steam 91 supplied to the low-pressure turbine 23 is used as steam for driving the low-pressure turbine 23. It is possible to increase the output of the steam power generation plant 1 a by using the thermal energy included in the carbon dioxide gas 42 containing water vapor emitted from the regeneration tower of the carbon dioxide separation and recovery plant 40 as the driving energy of the low-pressure turbine 23.
  • the carbon-dioxide-recovery-type steam power generation system may exchange heat with the carbon dioxide gas 42 containing water vapor using a part of the condensate 27 and use the generated steam 91 as a part of the steam for driving the low-pressure turbine 23. Accordingly, it is possible to efficiently recover the thermal energy and realize the high thermal efficiency.
  • Fig. 7 illustrates a schematic structure of a carbon-dioxide-recovery-type steam power generation system according to a sixth embodiment.
  • This embodiment is different from the fifth embodiment shown in Fig. 6 in that the steam 91 is supplied to the turbine 57 driving the compressors 53 and 54.
  • Fig. 7 the same portions as the portions of the fifth embodiment shown in Fig. 6 are denoted by the same reference numerals. The description thereof will not be repeated.
  • the steam 91 which is generated by the heat exchanging between a part of the condensate 27 in the CO 2 condenser 51 and the carbon dioxide gas 42 containing water vapor is supplied to the turbine 57.
  • the steam 91 is used to drive the turbine 57.
  • the heat recovered by the CO 2 condenser 51 may be used as the power of the turbine 57, and may supplement a part of the power of the compressors 53 and 54.
  • the steam discharged from the turbine 57 is joined as drainage to an appropriate position of the line 28 between the condensate pump 31 and the water supply pump 34.
  • the thermal energy of the carbon dioxide 42 emitted from the regeneration tower of the carbon dioxide separation and recovery plant 40 is recovered, and the generated steam is supplied to the compressor-driven turbine 57, so that a part of the power of the compressors 53 and 54 may be supplemented.
  • the carbon-dioxide-recovery-type steam power generation system 1 may efficiently recover the thermal energy and realize the high thermal efficiency.
  • the carbon-dioxide-recovery-type steam power generation system 1 may suppress degradation of the output of the steam power generation plant 1a in accordance with the ensured power source for compressing carbon dioxide.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Analytical Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Biomedical Technology (AREA)
  • Treating Waste Gases (AREA)
  • Carbon And Carbon Compounds (AREA)
  • Gas Separation By Absorption (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)
  • Drying Of Gases (AREA)
EP11185974.0A 2010-10-22 2011-10-20 Kohlendioxid-Wiederherstellungsverfahren und Kohlendioxid-Wiederherstellungs-Stromerzeugungssystem Not-in-force EP2444598B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2010237573A JP5558310B2 (ja) 2010-10-22 2010-10-22 二酸化炭素回収方法及び二酸化炭素回収型汽力発電システム

Publications (3)

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EP2444598A2 true EP2444598A2 (de) 2012-04-25
EP2444598A3 EP2444598A3 (de) 2017-05-31
EP2444598B1 EP2444598B1 (de) 2018-08-15

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EP11185974.0A Not-in-force EP2444598B1 (de) 2010-10-22 2011-10-20 Kohlendioxid-Wiederherstellungsverfahren und Kohlendioxid-Wiederherstellungs-Stromerzeugungssystem

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US (2) US8726662B2 (de)
EP (1) EP2444598B1 (de)
JP (1) JP5558310B2 (de)
CN (1) CN102562191B (de)
AU (1) AU2011239263B2 (de)
CA (1) CA2756157C (de)

Cited By (1)

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CN102562191B (zh) 2015-07-22
US9416683B2 (en) 2016-08-16
CN102562191A (zh) 2012-07-11
US20120096865A1 (en) 2012-04-26
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US8726662B2 (en) 2014-05-20
US20140208749A1 (en) 2014-07-31

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